Dental tool.



' (Application med .my 2e, 1906.) l

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UNITED- I STATES xPATENT OFFICE.'t

WILLIAM E. GRISWOLD, OF DENVER,` COLORADO, ASSIGNOR, BY DIRECT AND MESNE ASSIGNMENTS, TO GRISWOLD DENTAL BRIDGE COMPANY, OF DENVER, COLORADO, `A CORPORATION OF COLORADO.

' D TOOL.

SPECIFICATION forming part of nettet Pat'nt'o. 7o2,646, da.tea rune 17, 1902. Application lled J'Iily 28, 1990, Serial No. 25,172. (No model.)

To 'o1/ZZ whom, it may concern:

Be it known that I, WILLIAM E. GRIsWoLD, a citizen of the United States, residing at Denver, in the county of-Arapahoe and Stateof Colorado, have invented certainneW and useful Improvements in Dental Tools; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as Will enable others skilled in the art to which it appertains to make and usethe same.

My invention relates'to :improvements inl dental tools. Its object is to provide' animi-- strument especially applicable' in setting spring-studs perfectly parallel in models. i

The instrument comprisesas itsfprincipalV features a standard or supporting-post, a centering-post, and an adjustable vch'uckorcap holder.

In the accompanying drawings, Figure 1 is a perspective view of the instrument with a modelin place. Fig. 2 isa partial view in section, and Fig. 3 illustrates the spring-stud and capswhich I use in making my securing device for bridge-pieces. 1 represents a base-plate having pei-fora. tions 2, into which the plastic material of a model may run to secure it in place. I

V3 is a model, and 4 represents band-cap of roots in place in the model. y,

5 is a standard or supporting-post fixed to the base-plate 1. i

6 is a screw-threaded rod Withamilledhead playing in the top of the standard 5.

7 is a screw-threaded milled adjusting-nut working on the rod 6.

8 is a slot in the standard 5, through which plays a horizontal arm 9, shown here as rectang'ular at the end playing in the slot 8 and enlarged at the other end and cut away to form a lat face at 10.

. 11 is'ascreW-threaded centering-post adapted to take a purchase on the model 3.

12 is a milled head on the post 11.

13 is a milled adjusting screw-nut Working on the post 11.

14 is a screw-threaded milled head having an integral sleeve 15, surrounding and Working upon the post 11.

. 16 is a milled adjusting screw-nut Working on the post 11.

17 is a sleeve-journal turning on the sleeve 15 and bearing a horizontal arm 18.

19 is a chuck-head havinga slot 20, through which the arm 18 may play. v

,21 is a milled adjusting screw-rod playing inthe top of the chuck-head 19.

22 is the threaded end of the chuck-head 19, on which may be secured or adjusted the milled screw-threaded chuck 23, having the usual clasps 24.

' 25 represents my large-sized cap, 26 a -smaller size which may telescope the larger size, and 27 my spring-stud. I It Will-be observed that the sleeve 15 is :slightly longer than the sleeve 17, so that the binding may not be too tight to permit the easy swing of the arm 18 and the chuck.

It is obvious that these mechanical details maybe varied in many Ways-as, for example, by combining the standard 5 and' the arm 9 or by a diierent arrangement of the adjustving devices.

25 in case thelarger size is to be used, or it' one of smallersize is required I rst place the cap 25 and then in that the smaller cap 26, finally placing the spring-stud Within the smaller cap, the 'two caps telescoping, so that in this Way the instrument may be adapted for either of the two sizes. I then center the chuck-head 19 and bring it down by the adjusting means, so that the ends of the springstud rest on the base of the root. By this means I can determine the precise angle at Which the ends of the spring-stud andcap must be filed and can easilylremove "the holder for the purpose `of ilinggand replace 95 it if necessary to again measure and then-at intervals as required remove-it totnishfthe Illing. I am thus enabled to/readifly `placethe spring-studs in the cap and ascertain the exact angle for any particular cap or root.

IOO

My device, as is apparent, may be otherwise applied to the work of centering and gaging. In the description I have for purposes of illustration and application limited it t0 the specie uses defined.

Having fully described myinvention, what I claim isl. In a dental tool, the combination of a standard, a centering-post to rest upon a model, and an adjustable chuck or holder connected with the centering-post to carry toothsecuring devices.

2. In a dental tool, the combination of a standard, an adjustable securing or centering post to rest upon a model, and an adjustable and removable chuck or holder for carrying spring-studs or caps for teeth.

3. In a dental tool, the combination of a standard, a centering-post, a swinging arm carried by the centering-post and vertically adjustable thereon,and a chuck carried by the S\V1[lf2`1l]g arm.

4. In a dental tool, the combination of a standard, a screw-threaded centering-post, a sleeve having a screw-threaded head working on the centering-post, a journal-sleeve turning on the first-named sleeve and bearing a horizontal arm, and an adjustable chuck carried by the arm, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

WILLIAM GRISWOLD.

Witnesses:

WALTER F. ROGERS, EDNA A. HUGHES. 

